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首页> 外文期刊>Journal of Applied Polymer Science >Construction of Porous PVDF Coating Layer and Electrochemical Performances of the Corresponding Modified Polyethylene Separators for Lithium Ion Batteries
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Construction of Porous PVDF Coating Layer and Electrochemical Performances of the Corresponding Modified Polyethylene Separators for Lithium Ion Batteries

机译：多孔PVDF涂层的构建及相应的锂离子电池改性聚乙烯隔膜的电化学性能

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摘要

To effectively improve the affinity of polyethylene (PE) separators with liquid electrolyte without causing a serious pore blockage and to develop a more suitable technology for the industrial production process, porous polyvinylidene fluoride (PVDF) layer-coated PE separators are prepared by the dip-coating method followed by a dry-cast process. Different from previous investigations, a less volatile solvent and a relatively volatile nonsolvent are used to yield a preferable pore structure. A brief introduction on the pore formation mechanism during the dry-cast process is provided. The pore structure of coating layer is found to be successfully controlled by changing evaporation temperature, nonsolvent content, and PVDF concentration. The porous PVDF coating layermodified separators show better affinity with liquid electrolyte and thermal stability. Especially, the ionic conductivity of the modified separator/liquid electrolyte system with a suitable porous coating layer on the separator could reach two times as that of PE separator/ liquid electrolyte system, and the cell assembled with modified PE separator shows better cycle performances. This modification process is proved to be a facile, controllable, and effective method for PE separator modification. Meanwhile, this work could provide some theoretical and technical guidance for the production process. VC 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41036.
机译：为了有效地提高聚乙烯（PE）隔板与液体电解质的亲和力而又不会造成严重的孔堵塞，并开发出更适合工业生产工艺的技术，可通过浸涂法制备多孔聚偏二氟乙烯（PVDF）涂层的PE隔板涂覆方法，然后进行干法铸造工艺。与以前的研究不同，使用挥发性较小的溶剂和挥发性较大的非溶剂可产生较好的孔结构。简要介绍了干法铸造过程中的孔形成机理。发现通过改变蒸发温度，非溶剂含量和PVDF浓度可以成功地控制涂层的孔结构。多孔的PVDF涂层改性隔膜显示出与液体电解质更好的亲和力和热稳定性。尤其是，在隔板上具有合适的多孔涂层的改性隔板/液体电解质体系的离子电导率可以达到PE隔板/液体电解质体系的两倍，并且用改性PE隔板组装的电池表现出更好的循环性能。事实证明，该改性工艺是一种简便，可控制且有效的PE隔板改性方法。同时，这项工作可以为生产过程提供一些理论和技术指导。 VC 2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2014，131，41036。

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